are you concerned with the reliability of the shaft or its appearance? if it is reliability then the u joints are the only moving part on the shaft and they are new, unless you are pulling holeshots with a 500 hp motor everyday your current shaft is fine if it runs straight with no vibration issues. i had a built 383 vega with a rock crusher 4 speed, i side stepped the clutch a gazillion times with a stock shaft. i dont think i ever drove that car without pulling a holeshot! now if your after looks then go for aluminum, if steel is your replacement, you already have one of those. clean it up and paint it black.